/**
 * 
 */
package standard_module_api.test;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

/**
 * @author yzz
 * @create 2016年4月9日 上午10:39:37
 *  映射数据库，自动生成Entity
 * @author WWF
 */
public class createModel {

	private static Connection conn = null;
	private static final String URL;
	private static final String JDBC_DRIVER;
	private static final String USER_NAME;
	private static final String PASSWORD;
	private static final String DATABASENAME;
	private static final String PACKAGENAME;
	static {
		/*DATABASENAME = "数据库名";
		URL = "jdbc:postgresql://localhost:5432/" + DATABASENAME;
		JDBC_DRIVER = "org.postgresql.Driver";
		USER_NAME = "数据库帐号";
		PASSWORD = "密码";
		PACKAGENAME = "xidian.wwf.entity";*/
		DATABASENAME = "yzz";
		URL = "jdbc:mysql://127.0.0.1:3306/" + DATABASENAME;
		JDBC_DRIVER = "com.mysql.jdbc.Driver";
		USER_NAME = "root";
		PASSWORD = "yangzhenze";
		PACKAGENAME = "xidian.wwf.entity";
	}

	/**
	 * 获得连接
	 * 
	 * @return
	 */
	public static Connection getConnection() {
		try {
			Class.forName(JDBC_DRIVER);
			conn = DriverManager.getConnection(URL, USER_NAME, PASSWORD);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return conn;
	}

	/**
	 * 关闭数据库
	 */
	public static void closeConnection() {
		try {
			if (conn != null && !conn.isClosed()) {
				conn.close();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 生成字段静态声明
	 * 
	 * @param connection
	 * @param tableName
	 * @return
	 */
	private static String CreateEntityString(String tableName) {
		String result = "package " + PACKAGENAME + ";\n\n";
		result += "import com.jfinal.plugin.activerecord.Model; \n\n";
		result += "public class "
				+ toLowerCaseTheFristChar(tableName)
				+ " extends Model<"
				+ toLowerCaseTheFristChar(tableName) + ">{\n\n";
		result += "    private static final long serialVersionUID = 1L;\n";
		result += "    public static final "
				+ toLowerCaseTheFristChar(tableName) + " dao = new "
				+ toLowerCaseTheFristChar(tableName) + "();\n\n";
		result += "    /**表名**/ \n";
		result += "    public static String TABLE = \"" + tableName + "\";";
		String sql = "select column_name from information_schema.columns where table_name = '"
				+ tableName + "';";
		try {
			Statement statement = conn.createStatement();
			ResultSet resultSet = statement.executeQuery(sql);
			while (resultSet.next()) {
				if (resultSet.getString(1) != null
						&& !resultSet.getString(1).isEmpty()) {
					String string = resultSet.getString(1);
					String row = "    public static final String "
							+ string.toUpperCase(Locale.CHINA) + " = \""
							+ string + "\";";
					String note = "    /****/";
					result += "\n" + note + "\n" + row;
				}
			}
			resultSet.close();
			statement.close();
			result += "\n }";
			return result;
		} catch (SQLException e) {
			e.printStackTrace();
			return null;
		}
	}

	/**
	 * 获得数据库的所有表名
	 * 
	 * @return
	 */
	public static List<String> getAllTables() {
		String sql = "SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = '"+DATABASENAME+"'";
		try {
			List<String> result = new ArrayList<String>();
			Statement statement = conn.createStatement();
			ResultSet resultSet = statement.executeQuery(sql);
			while (resultSet.next()) {
				if (resultSet.getString(1) != null
						&& !resultSet.getString(1).isEmpty()) {
					result.add(resultSet.getString(1));
				}
			}
			return result;
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}

	/**
	 * 生成Entity
	 */
	public static void CreateEntity() {
		try {
			getConnection();
			List<String> tables = getAllTables();
			for (int i = 0; i < tables.size(); i++) {
				File createFolder = new File(System.getProperty("user.dir")
						+ "/src/" + PACKAGENAME.replace(".", "/"));
				// 路径不存在，生成文件夹
				if (!createFolder.exists()) {
					createFolder.mkdirs();
				}
				String entityString = CreateEntityString(tables.get(i).trim());
				File entity = new File(createFolder.getAbsolutePath() + "/"
						+ toLowerCaseTheFristChar(tables.get(i))
						+ ".java");
				if (!entity.exists()) {
					// 写入文件
					BufferedWriter out = new BufferedWriter(new FileWriter(
							entity, true));
					out.write(entityString);
					out.close();
					out = null;
					entity = null;
				}
			}
			closeConnection();
			System.out.println("生成成功");
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public static void main(String[] args) {
		CreateEntity();
	}
	
	private static String toLowerCaseTheFristChar(String str){
			StringBuffer sb = new StringBuffer();
			if(str!=null){
				for(int i=0;i<str.length();i++){
					char c = str.charAt(i);
					
					if(i == 0){
						sb.append(Character.toUpperCase(c));
					}else{
						sb.append(Character.toLowerCase(c));
					}
				}
			}
			
			return sb.toString();
	}

}
